# 1 26 26 triangle

### Acute isosceles triangle.

Sides: a = 1   b = 26   c = 26

Area: T = 12.99875959316
Perimeter: p = 53
Semiperimeter: s = 26.5

Angle ∠ A = α = 2.20438196787° = 2°12'14″ = 0.03884639095 rad
Angle ∠ B = β = 88.89880901607° = 88°53'53″ = 1.5521564372 rad
Angle ∠ C = γ = 88.89880901607° = 88°53'53″ = 1.5521564372 rad

Height: ha = 25.99551918631
Height: hb = 10.9998150717
Height: hc = 10.9998150717

Median: ma = 25.99551918631
Median: mb = 13.01992165663
Median: mc = 13.01992165663

Inradius: r = 0.49904753182
Circumradius: R = 13.00224045131

Vertex coordinates: A[26; 0] B[0; 0] C[0.01992307692; 10.9998150717]
Centroid: CG[8.67330769231; 0.33332716906]
Coordinates of the circumscribed circle: U[13; 0.25500462406]
Coordinates of the inscribed circle: I[0.5; 0.49904753182]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 177.7966180321° = 177°47'46″ = 0.03884639095 rad
∠ B' = β' = 91.10219098393° = 91°6'7″ = 1.5521564372 rad
∠ C' = γ' = 91.10219098393° = 91°6'7″ = 1.5521564372 rad

# How did we calculate this triangle?

Now we know the lengths of all three sides of the triangle and the triangle is uniquely determined. Next we calculate another its characteristics - same procedure as calculation of the triangle from the known three sides SSS. ### 1. The triangle circumference is the sum of the lengths of its three sides ### 2. Semiperimeter of the triangle ### 3. The triangle area using Heron's formula ### 4. Calculate the heights of the triangle from its area. ### 5. Calculation of the inner angles of the triangle using a Law of Cosines ### 6. Inradius ### 7. Circumradius ### 8. Calculation of medians #### Look also our friend's collection of math examples and problems:

See more informations about triangles or more information about solving triangles.